Exam 2. CSI 201: Computer Science 1 Fall 2016 Professors: Shaun Ramsey and Kyle Wilson. Question Points Score Total: 80
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1 Exam 2 CSI 201: Computer Science 1 Fall 2016 Professors: Shaun Ramsey and Kyle Wilson Question Points Score Total: 80 I understand that this exam is closed book and closed note and is to be completed without a calculator, phone, or other computer. I am NOT allowed to use any external resources to complete this exam. All of the work that I am submitting for this exam is mine. I have completed this exam in accordance with the Washington College Honor Code. Name: Signature: Section: 10: 11:30-12:20 11: 1:30-2:20 Page 1 of 7
2 1. Concepts. Answer each question briefly. (a) 3 points How many elements are in the following array? bool on_time[43]; (b) 3 points How are arrays and pointers related? (c) 3 points What important C++ rule does this function definition break? int[] makearrayoftenzeros() { int arr[10]; for (int i = 0; i < 10; ++i) arr[i] = 0; return arr; (d) 3 points Describe one possibility that could happen when this code is run: double * four_elements = new double[4]; cout << four_elements[100]; (e) 6 points Explain the differences between static and dynamic arrays. Page 2 of 7
3 2. Short Coding Questions. Write a line or two of code to answer each question. (a) 3 points Show how to call a function called printinstructions. Here is this function s prototype: void printinstructions(); (b) 3 points Write a line of C++ code to print out the value of the first element of an array called zebras. (c) 3 points Show how to free up the memory that is being used by the array arr, which was created like this: double * arr = new double[15]; (d) 3 points Write a prototype for a function called printarray that takes as input an array of type double and an integer length of the array. The function will not return anything. (e) 3 points Give a line of code to change the last element of an integer array to be equal to the second element of that array. The array is called puppies and the size variable is called N. Page 3 of 7
4 (f) 4 points Show how to declare a new array of doubles with 10 elements in two ways: (1) as a static array, and (2) as a dynamic array. (g) 5 points Give several lines of code that set every element of an array to -1. You should assume that the array is called choices and that the length of the array is stored in a variable named N. (h) 5 points Write a for loop to print every even-indexed element of an array to the console. You may assume that array has been declared and initialized elsewhere and is named sodas, and that the size of the array is stored in an int named num drinks. 3. Code Output. (a) 3 points What is the console output of the following code snippet? for (int q = 10; q > 4; q -= 2) { cout << q - 2 << endl; Page 4 of 7
5 (b) 3 points What value does the function call foo(12, 12, 12) return? double foo(int num1, int num2, int num3) { num1--; if (num1 < num2) num3 = num3-2; return num3 - num1; (c) 3 points Consider this definition for the function h: int h(int b, int a) { return b; What is the output of these lines of code? a = 4; b = 8; cout << h(a, b); (d) 4 points Suppose that the function f is defined like this: void f(int arr[], int size, int i){ if (i < size) arr[i] = 7; What is the console output of this code snippet? int numbers[4]; numbers[2] = -5; f(numbers, 4, 2); cout << numbers[2] << endl; Page 5 of 7
6 (e) 5 points What is the console output of the following code? #include <iostream> #include <string> using namespace std; int function1(int a, int b); int function2(int a, int b); int main() { int a = 2; int b = 1; cout << function1(a, b) << endl; int function1(int a, int b) { a = function2(a, b); if (a >= 3) { return a; else { return a + 3; int function2(int a, int b) { return a * 2 + b; Page 6 of 7
7 4. 15 points Write a function to compute the evaluation of the algorithm described below. Use good programming practice, and choose proper return types and parameter values. Also write a main that demonstrates at least one function call of this function. Algorithm: In math, the length of a vector of numbers is defined as the square root of the sum of the squares of the numbers. For example: length([1, 4, 6, 2]) = (1) 2 + (4) 2 + (6) 2 + ( 2) 2 = = Write a function that computes this vector length for any array of numbers. Clarification: You may not assume that input arrays always have 4 elements (like in the example). Your function must be general to any length array. Page 7 of 7
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